ML20214G703

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Summary of 770216-17 Meetings W/Mark II Owners Group,Ge & BNL in San Jose,Ca Re Monticello Test Results & Analytical Model Verification.Attendance List Encl
ML20214G703
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 03/03/1977
From: Teh-Chiun Su
Office of Nuclear Reactor Regulation
To: Lainas G
Office of Nuclear Reactor Regulation
References
CON-WNP-0168, CON-WNP-168 NUDOCS 8605220416
Download: ML20214G703 (3)


Text

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Enclosure 11 ~

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/ UNITED STATES NUCLEAR REGULATORY COMMISSION g WASHINGTON, D. C. 20585

% **... / MAR 3 1977 MEMORANDUM FOR: Gus C. Lainas, Chief, Containment Systems Branch, DSS POM: T. M. Su, Containment Systems Branch, DSS THRU: J. Kudrick, Section A Leader, Containment Systems Branch, DSS

SUBJECT:

SRV DISCUSSION WITH THE MARK II OWNERS GROUP Meetings were held on February 16 and 17,1977, in San Jose, California with representatives of General Electric, Mark II owner group, NRC staff and our consultants (BNL). The minutes of these meetings will be prepared by Sydney Miner, the project manager for Mark II containment.

This memo, however, is to apprise you about the discussions held on SRV loafings.

The discussion concentrated on two areas, namely, Monticello test re'sults and the analytical model verification. The following sumarizes this discussion:

Monticello Test Results The test results indicate that the air bubble was deflected consistently to one side along the ramshead discharge. Cause of this deflection is not yet detennined. Investigation of the tested ramsheads to determine any dislocation or obstructions on the discharge will be conducted in the next

scheduled outage.

It is anticipated that this phenomenon of deflected bubble will impose further difficulties for analytical model verification because of the instrumentation setup. Note that most of the pressure transducers were concentrated on one side of the discharge. There is only one pressure transducer in the side, which appears to be where the bubble was located.

Furthermore, the interference of the I-beam, which supports the ramshead l discharge, on the bubble pressure field appears significant. The applicability of the Monticello test for those plants without the I-beam should be evaluated.

I

Contact:

T. M. Su, CSB 492-7711 l

860522041e 770303 ADOCK0500g3 PDR ,

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o O3 197 7 Gus C. Lainas The applicability of the Monticello test for Mark II containment was also discussed. We indicated that concerns of fluid / structure interaction and orientation of the ramshead discharge should be considered. The Monticello is a steel containment while most of the Mark II designs are concrete containments. Also, the ramsheads for Monticello are oriented parallel with the boundaries while the Mark II containments such as Shoreham and Zimmer have the ramsheads oriented toward the boundaries.

Final report on Monticello test will be issued in April 1977.

Analytical Model GE indicated that the existing analytical model is being modified. Details of this modification has not been presented. However, GE indicated that one of the key assumptions, i.e., bubble formation efficiency, has been deleted in the modified model. A description of this model will be issued in June 1977.

The comparison of model with test data, however, will be made on the basis of existing model . Report on this comparison will be issued in the second quarter of 1977.

'M b T. M. Su Containment Systems Branch Division of Systems Safety cc: R. Tedesco C. Anderson J. Kudrick J. Shapaker S. Miner l T. Su File: BWR Pool SV/RV Load Problems (Ramshead) l l

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Enclosure No. 12 ATTENDANCE LIST FEBRUARY 16, 1977 NRC , NIPSCO BNL C. Anderson M. Granback C. Economos J. Glynn G. Maise C. Grimes C. Tung J. Kudrick GE 5, Miner T. Su W. Bilanin NUTECH W. Davis L. Frauenholz N. Edwards Burns & Roe J. Hosler S. Liu '

D. Baker P. Marriott NSC B. Bedrosian J. Martin P. Hsueh W. McConaghy P. Koppe R. Jensen R. Muzzy F. Schraub F. Rally PP&L S. Sandoz i U. Saxena Ebasco W. Barberich A. Singh E. Mead L. Sobon Y. Oktay A. Smith Bechtel ,

MIT (for BNL)

CGEco l J. Berry l B. Harper H. Brinkmann A. Sonin l E. McFarland G. Crane

J. Mulay WPPSS Stone & fiebster D. Bush S. Chow I W. Hennessy l LILCO l

S&L H. Chau W. Museler l R. Crawford .

Commision Federal de Electricidad E. Rukos l

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